CN113880293A - Alkali reduction wastewater treatment method and treatment system - Google Patents
Alkali reduction wastewater treatment method and treatment system Download PDFInfo
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- CN113880293A CN113880293A CN202111113680.4A CN202111113680A CN113880293A CN 113880293 A CN113880293 A CN 113880293A CN 202111113680 A CN202111113680 A CN 202111113680A CN 113880293 A CN113880293 A CN 113880293A
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C07C51/47—Separation; Purification; Stabilisation; Use of additives by solid-liquid treatment; by chemisorption
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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Abstract
The invention relates to the technical field of wastewater treatment, in particular to an alkali-reduction wastewater treatment method and an alkali-reduction wastewater treatment system, and provides a scheme which comprises the steps of filtering alkali-reduction wastewater after stirring and homogenizing by using an alkali-resistant tubular membrane filtration system to obtain a first liquid, filtering the first liquid by using an alkali-resistant nanofiltration membrane concentration system to obtain a second concentrated solution, adjusting the pH of the second concentrated solution to 3-4, performing filter pressing treatment on the second concentrated solution after pH adjustment by using a second plate-frame filter press to obtain a first filtrate and a first filtrate, purifying the first filtrate by using a purification tubular membrane filtration system to obtain a third concentrated solution, and performing filter pressing treatment on the third concentrated solution to obtain a second filtrate and a second filtrate, wherein the second filtrate is terephthalic acid. The invention extracts the terephthalic acid in the waste water for resource utilization through the membrane filtration technology and the membrane purification technology, thereby not only recovering valuable substances in the waste water, but also reducing the treatment difficulty and the treatment capacity of the waste water.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to an alkali-reduction wastewater treatment method and system.
Background
Along with the rapid development of national economy and the improvement of the economic level of residents, the demand of terylene is rapidly increased, wherein about 20 percent of terylene fibers need to be treated by an alkali decrement process, the alkali decrement process enables the terylene fabric to have the texture of silk broadcloth, and the cost performance is higher than that of the silk broadcloth, so that the terylene silk-like silk is more and more popular, but the alkali decrement process enables the wastewater to contain more Terephthalic Acid (TA) and other impurities, which brings the problem of wastewater treatment, the alkali decrement wastewater not only can cause environmental pollution and resource waste, but also has toxic action on fish and animals by harmful substances contained in the wastewater, therefore, the invention provides an alkali decrement wastewater treatment method and a treatment system.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an alkali-reduction wastewater treatment method and a treatment system.
In order to achieve the purpose, the invention adopts the following technical scheme:
an alkali-reduction wastewater treatment method and a treatment system, which comprises a collecting tank, wherein the collecting tank is communicated with an alkali-proof tubular membrane filtration system, the alkali-resistant tubular membrane filtration system is communicated with an alkali-resistant tubular membrane water production tank which is communicated with an alkali-resistant nanofiltration membrane concentration system, the alkali-resistant nanofiltration membrane concentration system is communicated with an alkali-resistant nanofiltration membrane concentrated solution tank, the alkali-resistant nanofiltration membrane concentrated solution tank is communicated with a pH adjusting device, the pH adjusting device is communicated with an acidification tank, the acid precipitation tank is communicated with a second plate-and-frame filter press, the second plate-and-frame filter press is communicated with a crude terephthalic acid washing tank, the crude terephthalic acid washing tank is communicated with a purification tubular membrane filtration system which is communicated with a purification tubular membrane concentrated solution tank, the purification tubular membrane concentrated solution tank is communicated with a third plate-and-frame filter press, and the third plate-and-frame filter press is communicated with a storage tank.
Further, alkali-resistant tubular membrane filtration system intercommunication has the dense pond of alkali-resistant tubular membrane, the dense pond intercommunication of alkali-resistant tubular membrane has first sheet frame filter press, first sheet frame filter press intercommunication has first sheet frame filter-pressing mud cake groove, first sheet frame filter-pressing mud cake groove intercommunication has the third pipeline, first sheet frame filter press is linked together with the collecting pit.
Further, the alkali-resistant nanofiltration membrane concentration system is communicated with an alkali-resistant nanofiltration membrane clear liquid tank, and the alkali-resistant nanofiltration membrane clear liquid tank is communicated with a second pipeline.
Further, the second plate-frame filter press is communicated with a reverse osmosis raw water tank, the reverse osmosis raw water tank is communicated with a third plate-frame filter press, the reverse osmosis raw water tank is communicated with a purification tubular membrane filtration system, the reverse osmosis raw water tank is communicated with a reverse osmosis reuse water film treatment system, the reverse osmosis reuse water film treatment system is communicated with a reverse osmosis concentrated water tank, the reverse osmosis concentrated water tank is communicated with a reverse osmosis concentrated water catalytic oxidation device, and the reverse osmosis concentrated water catalytic oxidation device is communicated with a fourth pipeline.
Furthermore, the reverse osmosis recycling water film treatment system is communicated with a reverse osmosis water production tank, the reverse osmosis water production tank is communicated with a constant pressure water supply device, and the constant pressure water supply device is communicated with the crude terephthalic acid washing tank.
An alkali weight reduction wastewater treatment method comprises the following steps: placing the alkali-reduction wastewater in a collecting tank for stirring and homogenizing, filtering the alkali-reduction wastewater after stirring and homogenizing by using an alkali-resistant tubular membrane filtration system to obtain a first liquid and a first concentrated solution, filtering the first liquid by using an alkali-resistant nanofiltration membrane concentration system to obtain a second liquid and a second concentrated solution, adjusting the pH of the second concentrated solution to 3-4, performing filter-pressing treatment on the second concentrated solution after pH adjustment by using a second plate-and-frame filter press to obtain a first filtrate and a first filtrate, purifying the first filtrate by using a purification tubular membrane filtration system to obtain a third concentrated solution, and performing filter-pressing treatment on the third concentrated solution by using a third plate-and-frame filter press to obtain a second filtrate and a second filtrate, wherein the second filtrate is terephthalic acid.
And further filtering the first concentrated solution by using a first plate-and-frame filter press to obtain a third filtrate and a third filtrate, mixing the third filtrate with the alkali weight reduction wastewater for retreatment, and using the third filtrate as a fuel.
And further, treating the first filtrate and the second filtrate by using a reverse osmosis recycling water film treatment system to obtain a fourth concentrated solution and a third liquid, treating the third liquid by using a reverse osmosis water production tank, taking the fourth liquid obtained after treatment as industrial water, and performing catalytic oxidation on the fourth concentrated solution by using a reverse osmosis concentrated water catalytic oxidation device.
Further, the alkali-resistant tubular membrane in the alkali-resistant tubular membrane filtration system is made of a polyether ketone, a ceramic membrane, a silicon carbide ceramic membrane or a sintered PVDF alkali-resistant membrane element, the tolerance pH is 1-14, the highest temperature resistance is 50 ℃, and the produced water suspended matter is less than 1 NTU;
the alkali-resistant nanofiltration membrane in the alkali-resistant nanofiltration membrane concentration system has the tolerance pH of 2-14, the highest temperature resistance of 50 ℃ and the rejection rate of the alkali-resistant nanofiltration membrane on sodium phthalate of more than or equal to 98%.
Furthermore, the aperture of the purification tubular membrane in the purification tubular membrane filtration system is 10nm-200nm, and the water yield is more than or equal to 98%.
The invention has the beneficial effects that:
according to the invention, most of alkali in the wastewater is recycled through a membrane filtration technology and a membrane purification technology, wherein the terephthalic acid is extracted for resource utilization, so that valuable substances in the wastewater are recycled, the treatment difficulty and treatment capacity of the wastewater are reduced, the alkali is less than the acid consumption for neutralization, resources are recycled, the medicament consumption is reduced, the wastewater treatment cost is saved, and social benefits and environmental benefits are obtained.
Drawings
FIG. 1 is a flow diagram of an alkali-abated wastewater treatment system according to the present invention.
Reference numbers in the figures: 101 collecting pool, 10 alkali-resistant tubular membrane filtration system, 102 alkali-resistant tubular membrane water generating pool, 103 alkali-resistant tubular membrane concentrated water pool, 0001 first plate-and-frame filter press, 106 first plate-and-frame filter press mud cake tank, 20 alkali-resistant nanofiltration membrane concentration system, 105 alkali-resistant nanofiltration membrane clear solution tank, 104 alkali-resistant nanofiltration membrane concentrated solution tank, 050 pH back adjustment device, 002 second plate-and-frame filter press, 107 acid precipitation pool, 109 crude terephthalic acid washing pool, 40 purification tubular membrane filtration system, 110 purification tubular membrane concentrated solution tank, 0003 third plate-and-frame filter press, 111 storage tank, 080 drying and packaging device, 108 reverse osmosis raw water tank, 30 reverse osmosis recycling water film treatment system, 112 reverse osmosis concentrated water tank, 113 reverse osmosis water generating tank, 070 constant pressure water supply device, 060 reverse osmosis concentrated water catalytic oxidation device, 6001 first pipeline, 6002 second pipeline, 6003 third pipeline and 6004 fourth pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, an alkali-reduction wastewater treatment system comprises a collecting tank 101, wherein alkali-reduction wastewater is discharged into the collecting tank 101 through a first pipeline 6001, an outlet pipeline of the collecting tank 101 is communicated with an inlet of an alkali-resistant tubular membrane filtration system 10, a clear liquid outlet of the alkali-resistant tubular membrane filtration system 10 is communicated with an inlet of an alkali-resistant tubular membrane water generating tank 102, a concentrated liquid outlet of the alkali-resistant tubular membrane filtration system 10 is communicated with an inlet of an alkali-resistant tubular membrane water generating tank 103, an outlet of the alkali-resistant tubular membrane water generating tank 103 is communicated with an inlet of a first plate and frame filter press mud cake tank 106, a sludge discharge port of the first plate and frame filter press mud cake tank 106 is communicated with an inlet of a first plate and frame filter press mud cake tank 106, an outlet of the first plate and frame filter press mud cake tank 106 is communicated with an outward-transporting third pipeline 6003, a filtered clear liquid outlet of the first plate and frame filter press is communicated with an inlet of the collecting tank 101, an outlet of the alkali-resistant tubular membrane water generating tank 102 is communicated with an inlet of an alkali-resistant nanofiltration membrane water generating tank 20, the clear liquid outlet of the alkali-resistant nanofiltration membrane concentration system 20 is communicated with the inlet of an alkali-resistant nanofiltration membrane clear liquid tank 105, and the outlet of the alkali-resistant nanofiltration membrane clear liquid tank 105 is communicated with an alkali liquid adding port of the previous alkali reduction process through an outward conveying second pipeline 6002;
the concentrated solution outlet of the alkali-resistant nanofiltration membrane concentration system 20 is communicated with the inlet of the alkali-resistant nanofiltration membrane concentrated solution tank 104, the outlet of the alkali-resistant nanofiltration membrane concentrated solution tank 104 is communicated with the inlet of a pH adjusting device 050, the outlet of the pH adjusting device 050 is communicated with the inlet of an acid precipitation tank 107, the outlet of the acid precipitation tank 107 is communicated with the inlet of a second plate-frame filter press 002, the outlet of the filtered clear solution of the second plate-frame filter press 002 is communicated with the inlet of a reverse osmosis raw water tank 108, the sludge discharge port of the second plate-frame filter press 002 is communicated with the inlet of a crude terephthalic acid washing tank 109, the outlet of the crude terephthalic acid washing tank 109 is communicated with the inlet of a purification tubular membrane filtration system 40, the clear solution outlet of the purification tubular membrane filtration system 40 is communicated with the inlet of the reverse osmosis raw water tank 108, the concentrated solution outlet of the purification tubular membrane filtration system 40 is communicated with the inlet of a purification tubular membrane concentrated solution tank 110, and the outlet of the purification tubular membrane concentrated solution tank 110 is communicated with the inlet of a third plate-frame filter press 0003, the clear liquid filtering outlet of the third plate and frame filter press 0003 is communicated with the inlet of a reverse osmosis raw water tank 108, the sludge discharge port of the third plate and frame filter press 0003 is communicated with the inlet of a storage tank 111 for placing purified terephthalic acid, the outlet of the storage tank 111 is communicated with the inlet of a device 080 for drying and packaging the purified terephthalic acid, the outlet of the reverse osmosis raw water tank 108 is communicated with the inlet of a reverse osmosis reuse water film treatment system 30, the concentrated liquid outlet of the reverse osmosis reuse water film treatment system 30 is communicated with the inlet of a reverse osmosis concentrated water tank 112, the outlet of the reverse osmosis concentrated water tank 112 is communicated with the inlet of a reverse osmosis concentrated water catalytic oxidation device 060, the outlet of the reverse osmosis concentrated water catalytic oxidation device 060 is connected with an exhaust fourth pipeline 6004, the outlet of the reverse osmosis water film reuse treatment system 30 is communicated with the inlet of a reverse osmosis water production tank 113, and the outlet of the reverse osmosis water production tank 113 is communicated with the inlet of a constant pressure water supply device 070, the outlet of the constant-pressure water supply device 070 is communicated with the water inlet of the crude terephthalic acid washing tank 109;
the membrane material of the alkali-resistant tubular membrane system is polyether ketone (PEK), a ceramic membrane, a silicon carbide ceramic membrane and a sintered PVDF (polyvinylidene fluoride) alkali-resistant membrane element, the tolerance pH range is 1-14, the temperature resistance can reach 50 ℃, and the produced water suspended matter (SS) is less than 1 NTU;
the alkali-resistant nanofiltration membrane has the tolerance pH of 2-14, the temperature resistance can reach 50 ℃, the pH of produced water is more than or equal to that of inlet water, and the rejection rate of sodium terephthalate is more than or equal to 98%;
the pH is adjusted back to 3-4 by adding 50% dilute sulfuric acid, and the mixture enters an acidification tank through a pipeline mixer;
the purified tubular membrane filtration system adopts a membrane with the aperture of 10nm-200nm, and the water yield is more than or equal to 98 percent;
the reverse osmosis recycling water film treatment system has the water production rate of more than or equal to 80 percent and the desalination rate of more than or equal to 98 percent.
The mud cake of the first plate-and-frame filter press is transported to a thermal power plant for incineration treatment, and after the reverse osmosis concentrated water is further treated by a catalytic oxidation device, the COD of the reverse osmosis concentrated water meets the storage pipe standard of a sewage station in a park and the reverse osmosis concentrated water is discharged into the sewage station;
each of the above systems or the clear liquid tank and the like is a conventional device, and the following description is given to the main components thereof:
alkali-resistant tubular membrane filtration system: the device comprises a water inlet pump, a CIP cleaning device, a circulating pump, a membrane assembly, various sensors and a pneumatic valve; the function is to filter and remove insoluble suspended matters in the original water of the alkali decrement, and meet the water quality index requirement of the inlet water of the back-end system;
alkali-resistant tubular membrane water production pool: the device comprises a water pool and a liquid level sensor; the device is used for collecting water produced by the alkali-resistant tubular membrane filtration system, and plays a role in buffering and storing;
alkali-resistant tubular membrane concentrated water tank: the device comprises a water pool and a liquid level sensor; the device is used for collecting concentrated water generated by the alkali-resistant tubular membrane filtration system, and plays a role in buffering and storing;
alkali-resistant nanofiltration membrane concentration system: the device comprises a water inlet pump, a CIP cleaning device, a circulating pump, a booster pump, a membrane assembly, various sensors and various pneumatic valves; the concentrated sodium terephthalate is sent to the alkaline-resisting nanofiltration membrane concentrated solution tank to be stored for the next working procedure;
alkali-resistant nanofiltration membrane clear liquid tank: the device comprises a water tank and a liquid level sensor; the device is used for collecting the water produced by the alkali-resistant nanofiltration membrane and has the buffer storage function;
alkali-resistant nanofiltration membrane concentrated solution tank: the device comprises a water tank and a liquid level sensor; the device is used for collecting alkali-resistant nanofiltration membrane concentrated water to play a role in buffering and storing;
and a pH adjusting device: the device comprises an acid storage tank, an acid adding metering pump, a pH meter and a pipeline mixer, and is used for adjusting the pH of the concentrated water of the alkali-resistant nanofiltration membrane from alkalinity to 3-4 and separating out terephthalic acid in the water;
purification tubular membrane filtration system: the device comprises a water inlet pump, a CIP cleaning device, a circulating pump, a membrane assembly, various sensors and a pneumatic valve; the function is to remove inorganic salt and water-soluble substances in the terephthalic acid solid through filtration and dialysis, and the concentrated solution meets the purity requirement;
reverse osmosis recycling water film treatment system: the device comprises a water inlet pump, a CIP cleaning device, a circulating pump, a booster pump, a membrane assembly, various sensors and various pneumatic valves; the function is that the concentration plate frame filter presses the clear water, the produced water is recycled, and the concentrated solution is sent to the next catalytic oxidation device for further treatment;
the reverse osmosis concentrated water catalytic oxidation device comprises: the device comprises an ozone generator and a catalytic oxidation reactor, and has the function of oxidizing and decomposing organic matters in reverse osmosis concentrated water into carbon dioxide and water to ensure that COD of the organic matters meets the nano-tube standard of a sewage station in a park and the carbon dioxide and the water are discharged into the sewage station;
according to the treatment system, the alkali-reduction wastewater treatment method comprises the following steps:
step 1: alkali reduction wastewater is discharged into a collecting pool 101 through a first pipeline 6001 and an electromagnetic flowmeter, the retention time is designed to be 12 hours, a stirring device is arranged for homogenization, the homogenized alkali reduction wastewater is filtered and separated through an alkali-resistant tubular membrane filtration system 10, clear liquid enters an alkali-resistant tubular membrane water production pool 102, concentrated liquid enters an alkali-resistant tubular membrane concentrated water pool 103, insoluble impurities such as fibers in the wastewater are removed through filtration of a first plate and frame filter press 0001, the plate and frame clear liquid returns to the collecting pool 101, and mud cakes of the first plate and frame filter press 0001 are transported out to a thermal power plant for incineration treatment and used as a power generation raw material of the thermal power plant;
step 2: concentrating the clear liquid in the alkali-resistant tubular membrane water production tank 102 in the step 1 by an alkali-resistant nanofiltration membrane concentration system 20, feeding the clear liquid of the nanofiltration membrane into an alkali-resistant nanofiltration membrane clear liquid tank 105, recycling the clear alkali water and the clear alkali water of the nanofiltration membrane into an alkali reduction process, feeding the concentrated liquid into an alkali-resistant nanofiltration membrane concentrated liquid tank 104, wherein the concentrated liquid amount is about 10 percent of the total water inflow, and the concentrated liquid amount contains more than 98 percent of sodium terephthalate;
and step 3: in the step 2, sodium terephthalate in the alkali-resistant nanofiltration membrane concentrated solution tank 104 is conveyed to the acid precipitation tank 107 by a conveying pump, 50% dilute sulfuric acid is added to adjust back the pH value to enter the acid precipitation tank 107 through a pipeline mixer 050 in order to avoid heat release and unsafe factors caused by dissolution of the concentrated sulfuric acid during conveying, the pH value is monitored by a pH meter after entering the acid precipitation tank 107 and stirring, terephthalic acid is precipitated, and the acid precipitation principle is as follows: NaOOC-C6H4-COONa+H2SO4→HOOC-C6H4-COOH↓+Na2SO4；
And 4, step 4: filter-pressing the crude terephthalic acid obtained in the step 3 by a second plate-and-frame filter press 002 to obtain crude terephthalic acid solid, feeding the crude terephthalic acid solid into a crude terephthalic acid washing tank 109, adding water (reverse osmosis membrane produced water) into the tank to dilute the crude terephthalic acid solid, uniformly stirring, filtering, washing and dialyzing by a purification tubular membrane filtration system 40, removing soluble inorganic salts and other soluble organic matters in the feed liquid in clear liquid, feeding the purified tubular membrane concentrated solution into a purification tubular membrane concentrated solution tank 110, filter-pressing the concentrated solution by a third plate-and-frame filter press 0003, feeding the mud cake into a purified terephthalic acid storage tank 111, drying by a purified terephthalic acid drying device, and packaging by a packaging device 080 to obtain a terephthalic acid product;
and 5: collecting the filtrate obtained by 002 pressure filtration of the second plate-and-frame filter press in the step 4, the filtrate obtained by 40 pressure filtration of the purification tube type membrane filtration system and the filtrate obtained by 0003 pressure filtration of the third plate-and-frame filter press into a reverse osmosis raw water tank 108, wherein the main components of the part of water are inorganic salts and soluble organic matters (micromolecular organic matters such as ethylene glycol except terephthalic acid), the part of water is pretreated and then enters a reverse osmosis recycling water film treatment system 30, the produced concentrated water enters a reverse osmosis concentrated water tank 112, the produced clear water enters a reverse osmosis water production tank 113, and the water production tank is connected with a constant pressure water supply device 070 to a process water consumption point;
step 6: and (3) after the reverse osmosis concentrated water (accounting for less than 10% of the total water quantity to be treated) produced in the step (5) is further treated by the catalytic oxidation device 060, the COD (chemical oxygen demand) of the reverse osmosis concentrated water meets the storage pipe standard of the sewage station in the garden, and the reverse osmosis concentrated water is discharged into the sewage station.
In the description of the present invention, it is to be understood that the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", "tenth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides an alkali decrement effluent disposal system, its characterized in that, includes collecting pit (101), collecting pit (101) intercommunication has alkali-resisting tubular membrane filtration system (10), alkali-resisting tubular membrane filtration system (10) intercommunication has alkali-resisting tubular membrane to produce pond (102), alkali-resisting tubular membrane produces pond (102) intercommunication has alkali-resisting nanofiltration membrane concentration system (20), alkali-resisting nanofiltration membrane concentration system (20) intercommunication has alkali-resisting nanofiltration membrane concentrated solution jar (104), alkali-resisting nanofiltration membrane concentrated solution jar (104) intercommunication has back-off pH device (050), back-off pH device (050) intercommunication has acid out pond (107), acid out pond (107) intercommunication has second railway board frame pressure filter (002), second railway board frame pressure filter (002) intercommunication has thick terephthalic acid washing tank (109), thick terephthalic acid washing tank (109) intercommunication has purification tubular membrane filtration system (40), the purification tubular membrane filtration system (40) is communicated with a purification tubular membrane concentrated solution pool (110), the purification tubular membrane concentrated solution pool (110) is communicated with a third plate and frame filter press (0003), and the third plate and frame filter press (0003) is communicated with a storage tank (111).
2. The alkali-reduction wastewater treatment system according to claim 1, wherein the alkali-resistant tubular membrane filtration system (10) is communicated with an alkali-resistant tubular membrane concentrated water tank (103), the alkali-resistant tubular membrane concentrated water tank (103) is communicated with a first plate and frame filter press mud cake tank (106), the first plate and frame filter press mud cake tank (106) is communicated with a third pipeline (6003), and the first plate and frame filter press mud cake tank (0001) is communicated with the collection pool (101).
3. The alkali-reduction wastewater treatment system according to claim 1, wherein the alkali-resistant nanofiltration membrane concentration system (20) is connected to an alkali-resistant nanofiltration membrane clear water tank (105), and the alkali-resistant nanofiltration membrane clear water tank (105) is connected to a second pipeline (6002).
4. The alkali-reduction wastewater treatment system according to claim 1, wherein the second plate and frame filter press (002) is connected to a reverse osmosis raw water tank (108), the reverse osmosis raw water tank (108) is connected to a third plate and frame filter press (0003), the reverse osmosis raw water tank (108) is connected to a purification tube type membrane filtration system (40), the reverse osmosis raw water tank (108) is connected to a reverse osmosis reuse water membrane treatment system (30), the reverse osmosis reuse water membrane treatment system (30) is connected to a reverse osmosis concentrated water tank (112), the reverse osmosis concentrated water tank (112) is connected to a reverse osmosis concentrated water catalytic oxidation device (060), and the reverse osmosis concentrated water catalytic oxidation device (060) is connected to a fourth tube (6004).
5. The alkali-minimization wastewater treatment system according to claim 4, wherein the reverse osmosis reuse water membrane treatment system (30) is connected to a reverse osmosis water production tank (113), the reverse osmosis water production tank (113) is connected to a constant pressure water supply device (070), and the constant pressure water supply device (070) is connected to the crude terephthalic acid washing tank (109).
6. The alkali weight reduction wastewater treatment method is characterized by comprising the following steps:
placing the alkali-reduction wastewater in a collection pool (101) for stirring and homogenizing, filtering the alkali-reduction wastewater after stirring and homogenizing by using an alkali-resistant tubular membrane filtration system (10) to obtain a first liquid and a first concentrated solution, filtering the first liquid by using an alkali-resistant nanofiltration membrane concentration system (20) to obtain a second liquid and a second concentrated solution, adjusting the pH of the second concentrated solution to 3-4, performing filter-pressing treatment on the second concentrated solution after pH adjustment by using a second channel plate-frame filter press (002) to obtain a first filtrate and a first filtrate, purifying the first filtrate by using a purification tubular membrane filtration system (40) to obtain a third concentrated solution, and performing filter-pressing treatment on the third concentrated solution by using a third channel plate-frame filter press (0003) to obtain a second filtrate and a second filtrate, wherein the second filtrate is terephthalic acid.
7. The alkali weight reduction wastewater treatment method as defined in claim 6, wherein the first concentrated solution is filtered by a first plate and frame filter press (0001) to obtain a third filtrate and a third filtrate, and the third filtrate is mixed with the alkali weight reduction wastewater for reprocessing, and the third filtrate is used as a fuel.
8. The alkali-minimization wastewater treatment method according to claim 6, wherein the first filtrate and the second filtrate are treated by a reverse osmosis reuse water membrane treatment system (30) to obtain a fourth concentrate and a third liquid, the third liquid is treated by a reverse osmosis water production tank (113) and the fourth liquid obtained after the treatment is used as industrial water, and the fourth concentrate is catalytically oxidized by a reverse osmosis concentrated water catalytic oxidation device (060).
9. The alkali-reduction wastewater treatment method according to claim 6, wherein the alkali-resistant tubular membrane in the alkali-resistant tubular membrane filtration system (10) is a polyether ketone, ceramic membrane, silicon carbide ceramic membrane or sintered PVDF alkali-resistant membrane element, and has a tolerance pH of 1-14, a maximum temperature resistance of 50 ℃, and a water-producing suspended matter < 1 NTU;
the alkali-resistant nanofiltration membrane in the alkali-resistant nanofiltration membrane concentration system (20) has the tolerance pH of 2-14, the highest temperature resistance of 50 ℃, and the rejection rate of the alkali-resistant nanofiltration membrane to sodium phthalate being more than or equal to 98%.
10. The alkali-minimization wastewater treatment method according to claim 6, wherein the pore diameter of the purification tubular membrane in the purification tubular membrane filtration system (40) is 10nm to 200nm, and the water yield is not less than 98%.
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